Doing q45 front brakes on s13.. ran into problem.. HELP!!!

[SiLviAgYrl]

my car 92 s13

my situation

changing calipers to q45 calipers
used stock s13 rotors..

all bolts up ready to go, doesnt clamp hard? we bleed and bleed it over and over nothing. still soft?

what to do? will it not fully compress without using a q45 rotor? ive heard that ppl would put the q45 calipers straight on no problems. everyone and there mom swore they bolted right up.

help me asap !!

[thejester03]

Master cylinder not being able to put down enough power?

[SiLviAgYrl]

im not sure? my friend has a s13 w/ z32 with stock master cylinder and its fine? i dont know. any suggestions anyone?

[mandoz85]

you need q45 rotors

[mrmephistopheles]

you need q45 rotors
the truth has been spoken. don't halfass the job.

[Skaterjunky8]

the truth has been spoken. don't halfass the job.

You NEED them or you SHOULD use them? I have seen z32 callipers run on stock 13 rotors

[g6civcx]

If you wanted to use stock S13 brake discs you should just stay with the stock calipers.

[SiLviAgYrl]

If you wanted to use stock S13 brake discs you should just stay with the stock calipers.

We got the calipers we need to do a pad job and the Q45s have brand new pads already, we just want to put it on is it possible to do it with the stock rotors? or do we need a spacer or something? It seems like we got them all bled but they seem to be dragging, like they are always engaged

[OptionZero]

the whole point of q45 calipers is to use the larger 11inch q45 rotors for better heat management

dont be a fuckin pansy and get some new brembo blanks, they're like 25bucks a pop or something

[mrmephistopheles]

are you kidding me? use the proper rotor for the proper application!
Just because you can jury-rig something to 'sorta' work doesn't mean it's good. Brakes=life. If you can't stop you'll die.
I don't trust my life to halfassed jobs.
If you want to, go ahead. I'll pick past the bloody parts in the junkyard for the good stuff.

[i3litzace]

The s13 4 lug rotors are 257 mm by 22 mm (9.8" by 0.87") where as the Q45 5 lug rotors are 280 mm by 28 mm (11" by 1.10"). They are different diameters and different thicknesses. The s13 rotors will not work with q45 calipers. When you get the Q45 rotors you will have to drill/machine shop the q45 rotors to 4 lug for them to fit.

But i heard that you can buy 4 lug altima rotors which are the same diameter (11") and have to get extra shims since it is only 22 mm thick (.866"). I am not sure of this so if there is someone that has done, please confirm.

[MikeisNissan]

you NEED Q45 rotors. Or a rotor the same size as the Q45 which is 280mm or 11inches.

[Z U L8R]

that's like putting a t67 on an sr20 but not putting intercooler piping on it, use the q45 rotor. one of the bolt holes lines up with the 4 lug, mark em and drill the other 3 holes, they don't even have to be perfect....the rotor's are hubcentric ^_^_^_^_^_^

Dave =]

[DaPCWiz]

Wow... does the Q45 brake pad even cover the S13 rotor? Don't you only have about 50% pad coverage? Do the pads even stay aligned under braking? There is all kinds of stuff wrong with that. Get the right rotors...

[Neejay]

that's like putting a t67 on an sr20 but not putting intercooler piping on it, use the q45 rotor. one of the bolt holes lines up with the 4 lug, mark em and drill the other 3 holes, they don't even have to be perfect....the rotor's are hubcentric ^_^_^_^_^_^

Dave =]+1

Wow... does the Q45 brake pad even cover the S13 rotor? Don't you only have about 50% pad coverage? Do the pads even stay aligned under braking? There is all kinds of stuff wrong with that. Get the right rotors...+1

This is very dangerous. I've never even heard of someone attempting to use stock s13 rotors with upgraded calipers.

Won't the rotors drastically over heat?

[garagelu]

the reason why you have a soft pedal and increased pedal travel is because of the fact that the s13 rotors is thinner than the q45 rotors. So this means the brake pad has to travel farther to contact the rotor. This transfers to the pedal, making it mushy and no pedal feel to it.

[5t341tH]

the reason why you have a soft pedal and increased pedal travel is because of the fact that the s13 rotors is thinner than the q45 rotors. So this means the brake pad has to travel farther to contact the rotor. This transfers to the pedal, making it mushy and no pedal feel to it.
yep yep. same thing i was thinking

[joshchewuhh]

the whole point of getting q45 brakes is for the bigger rotors and 2 piston calipers.

get some cheap blanks from Autozone they'll be fine!

[x'ed]

I just picked up q45 rotors and have a 4 lug car, should I use blanks instead? would that be a better idea? I have the q45 calipers as well.

To the op, I got the rotors for like 30-40 bucks at the junk yard, y not just get them, do you have some reason or are you just increadibly inpatient?

[smelly240]

just buy brembo blanks or some rotors from somewhere - and drill em 4 lug and be done. or just leave it like it is and go canyon racing

[yarou]

changing calipers to q45 calipers
used stock s13 rotors..



http://www.esreality.com/files/placeimages/2007/55173-lolwut.jpg

[boogerlovers]

yeah dont half ass this shit, like Mr. Meph said brakes=life, im about to do the same brake conversion myself and i wouldnt think twice about using a Q45 rotor and getting it redrilled...

[x'ed]

so i know i am hijacking the thread, but is it better to get blanks drilled or just get the q45 rotors redrilled. I feel like an idiot now knowing that I could have bought blanks for fifty bucks instead of buying rotors with 100k on them for almost the same price. Should I just drill the q45 rotors to four lug, or sell them and buy blanks and get them drilled for four lug? Is it at all dangerous to drill the five lugs for a four lug application, especially since there are the two extra holes, so it will have ten holes with the redrilling.

Thanks

[Z U L8R]

F*** blanks, get the q45 rotor's

take off your 4 lug rotor, take your q45 rotor, put a bolt through one of the lug holes on both of them. line up the centers. clamp them together. mark them. put them on a drill press and drill 3 holes. take the other rotor and repeat.

install, have a nice day

Dave =]

[racepar1]

Whoa, what the hell is such an old thread doing up here?

[x'ed]

this is the guy who revived it's first, pretty random. So q45 rotors are superior to the blanks then? cool.

By the way, z u later, I am in love with your car.

[projectRDM]

Do you even know what blanks are? A blank is just a pressed, machined rotor from any number of suppliers, identical to an OE rotor in size, thickness, etc. but made in a lesser known facility. The OE rotor is made by Sumitomo or another big OE supplier, the blank is not, but the difference is nearly nothing as long as it's solid and cast, which it has to be. If the OE rotor is a few dollars more, get it, but if it's twice the price than your bargain AutoZone, NAPA, etc. rotor there's no need to spend the extra money. Rotors are a wear item anyway.

[Z U L8R]

i said F*** blanks cause you already have 1 hole drilled for you and can utilize it to line up the other 3 so you can make it easier on yourself, rather than starting from scratch with no holes. it's quicker to drill through 1/4 inch+ steel 6 times than it is 8 times....

:P

240's have single piston calipers where as q45's have dual piston calipers and a little bigger/thicker rotors @ X'ed , and thx for the compliment :D

Dave =]

[projectRDM]

Blanks are drilled for 4lug as well. I've never seen a rotor without holes predrilled. 'Blanks' refers to imitation, die cut rotors that any low line auto parts stores sell.

[x'ed]

Blanks are drilled for 4lug as well. I've never seen a rotor without holes predrilled. 'Blanks' refers to imitation, die cut rotors that any low line auto parts stores sell.

Oh I see, I was under the impression that blanks were not drilled at all. Don't see why the guy two posts above you has to be rude, just asking a technical question in the technical section! Thanks for the help guys! I guess I'll get my local machine shop to drill the lug holes, can't wait to actually have brakes that stop my car :rawk: .

Z U Later, your welcome!! Makes me miss my 1979 rx7 with a 13bt motor and tranny swap from a second gen rx7 with a ford 9" rear end. That baby weighed 2000lbs and had 220whp. God I miss that car. 70's jap sports cars are so sexy, especially when done as well as yours!

[Neejay]

Blanks are not drilled.

Blank = flat rotor surface (obviously, pre-drilled with lug holes)
Drilled = holes/dimples on rotor surface (obviously, pre-drilled with lug holes)

Q45 rotors will have to have 3 extra lug holes drilled to fit the 240sx bolt pattern.

[x'ed]

Yeah I was pretty sure, didn't want to say anything because I wasn't positive, but the pictures I have seen online are always undrilled. So I was right, they were wrong, yay me, lol. Just kidding. I think I will get some blanks then, seems safer to have only four holes in the rotor as opposed to 8, but hey, having eight is sorta like being cross drilled, lol.


But what's the smartest option, redrilling the q45 rotors, getting four lug altima rotors (not as thick but apparently work with q45 calipers), or getting blank q45 rotors?

And what would my options be for the rear brakes?